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RadonVerdict

County evidence note

Radon zone and test data for Gloucester County, NJ

County data can show why testing matters. It cannot tell you the radon level in a particular house. The only property-level answer comes from a valid test.

What the source supports

Gloucester County, NJ is interpreted from NJ municipal radon tiers, not a county average.

Gloucester County, NJ has 7 Tier 1 municipalities, 14 Tier 2 municipalities, and 3 Tier 3 municipalities in the NJ DEP radon potential table.

Source hierarchy: NJ DEP radon potential tiers are used for this county, with EPA zone and Census housing data as supporting context.

EPA map zone: Zone 2

The EPA map predicts broad county potential; it is not a measurement for an address.

What to do with this information

  1. 1. Test the homeUse a valid device and record duration, placement, and conditions.
  2. 2. Interpret the resultTreat 4.0 pCi/L as the main action threshold and preserve the testing context.
  3. 3. Use qualified helpFor testing or mitigation, use state requirements and recognized proficiency programs.

Evidence profile for Gloucester County

Reported averageTier 2 dominant
At or above 4.029.2% Tier 1
Source test volume24 municipalities
Comparison cohort21

NJ DEP publishes municipal radon-potential tiers, so this county is interpreted from local tier concentration rather than a county pCi/L average.

Nearby comparison: compare NJ counties by Tier 1 and Tier 1-or-2 municipal share, then let the home test decide action.

Editorial and Data Transparency

Author
RadonVerdict (Independent public-data software project)
Evidence Review
Official and primary sources cited below
Data Retrieved At
2026-02-24

Primary Sources